Can I use Slack as a CLI?

Yes. KosmoKrator exposes a Slack CLI through kosmo integrations:call and the provider shortcut command. Commands can return JSON for scripts, CI, and coding agents.

Can I expose Slack through MCP?

Yes. The KosmoKrator MCP gateway can expose selected Slack tools to clients such as Claude Code, Cursor, Codex, and other MCP-compatible tools.

Where are Slack credentials stored?

Slack credentials are configured in KosmoKrator's local integration settings and reused by CLI, Lua, and MCP gateway surfaces.

Can I deny write access for Slack MCP tools?

Yes. Start the gateway with --write=deny for read-only clients, or use ask/allow only for trusted workspaces.

productivity

Slack CLI for AI Agents

Use the Slack CLI from KosmoKrator to call Slack tools headlessly, return JSON, inspect schemas, and automate workflows from coding agents, scripts, and CI.

25 functions 13 read 12 write API token auth

Submit Slack feedback View package source

Slack CLI Setup

Slack can be configured headlessly with `kosmokrator integrations:configure slack`.

# Install KosmoKrator first if it is not available on PATH.
curl -fsSL https://raw.githubusercontent.com/OpenCompanyApp/kosmokrator/main/install.sh | bash

# Configure and verify this integration.
kosmokrator integrations:configure slack --set bot_token="$SLACK_BOT_TOKEN" --enable --read allow --write ask --json
kosmokrator integrations:doctor slack --json
kosmokrator integrations:status --json

Credentials

Authentication type: API token api_token. Configure credentials once, then use the same stored profile from scripts, coding CLIs, Lua code mode, and the MCP gateway.

Key	Env var	Type	Required	Label
`bot_token`	`SLACK_BOT_TOKEN`	Secret `secret`	yes	Bot Token

Call Slack Headlessly

Use the generic call form when another coding CLI or script needs a stable universal interface.

kosmo integrations:call slack.slack_send_message '{
  "channel": "example_channel",
  "text": "example_text",
  "blocks": "example_blocks",
  "thread_ts": "example_thread_ts",
  "reply_broadcast": true,
  "unfurl_links": true,
  "markdown": true
}' --json

Use the provider shortcut form for shorter human-facing commands.

kosmo integrations:slack slack_send_message '{
  "channel": "example_channel",
  "text": "example_text",
  "blocks": "example_blocks",
  "thread_ts": "example_thread_ts",
  "reply_broadcast": true,
  "unfurl_links": true,
  "markdown": true
}' --json

Agent Discovery Commands

These commands return structured output for coding agents that need to inspect capabilities before choosing a function.

kosmo integrations:docs slack --json
kosmo integrations:docs slack.slack_send_message --json
kosmo integrations:schema slack.slack_send_message --json
kosmo integrations:search "Slack" --json
kosmo integrations:list --json

All CLI Functions

Every function below can be called headlessly. The generic form is stable across all integrations; the provider shortcut is shorter but specific to Slack.

`slack.slack_send_message`

Write write

Send a message to a Slack channel or DM. Supports text, blocks, and thread replies.

Parameters: channel, text, blocks, thread_ts, reply_broadcast, unfurl_links, markdown

Generic CLI call

kosmo integrations:call slack.slack_send_message '{"channel":"example_channel","text":"example_text","blocks":"example_blocks","thread_ts":"example_thread_ts","reply_broadcast":true,"unfurl_links":true,"markdown":true}' --json

Provider shortcut

kosmo integrations:slack slack_send_message '{"channel":"example_channel","text":"example_text","blocks":"example_blocks","thread_ts":"example_thread_ts","reply_broadcast":true,"unfurl_links":true,"markdown":true}' --json

`slack.slack_update_message`

Write write

Update an existing Slack message.

Parameters: channel, ts, text, blocks

Generic CLI call

kosmo integrations:call slack.slack_update_message '{"channel":"example_channel","ts":"example_ts","text":"example_text","blocks":"example_blocks"}' --json

Provider shortcut

kosmo integrations:slack slack_update_message '{"channel":"example_channel","ts":"example_ts","text":"example_text","blocks":"example_blocks"}' --json

`slack.slack_delete_message`

Write write

Delete a message from a Slack channel.

Parameters: channel, ts

Generic CLI call

kosmo integrations:call slack.slack_delete_message '{"channel":"example_channel","ts":"example_ts"}' --json

Provider shortcut

kosmo integrations:slack slack_delete_message '{"channel":"example_channel","ts":"example_ts"}' --json

`slack.slack_get_message`

Read read

Get a specific message by its timestamp. Optionally fetch a message within a thread.

Parameters: channel, ts, thread_ts

Generic CLI call

kosmo integrations:call slack.slack_get_message '{"channel":"example_channel","ts":"example_ts","thread_ts":"example_thread_ts"}' --json

Provider shortcut

kosmo integrations:slack slack_get_message '{"channel":"example_channel","ts":"example_ts","thread_ts":"example_thread_ts"}' --json

`slack.slack_search_messages`

Read read

Search for messages across all Slack channels and DMs.

Parameters: query, count, page, sort, sort_dir

Generic CLI call

kosmo integrations:call slack.slack_search_messages '{"query":"example_query","count":1,"page":1,"sort":"example_sort","sort_dir":"example_sort_dir"}' --json

Provider shortcut

kosmo integrations:slack slack_search_messages '{"query":"example_query","count":1,"page":1,"sort":"example_sort","sort_dir":"example_sort_dir"}' --json

`slack.slack_get_permalink`

Read read

Get a permalink URL for a specific Slack message.

Parameters: channel, message_ts

Generic CLI call

kosmo integrations:call slack.slack_get_permalink '{"channel":"example_channel","message_ts":"example_message_ts"}' --json

Provider shortcut

kosmo integrations:slack slack_get_permalink '{"channel":"example_channel","message_ts":"example_message_ts"}' --json

`slack.slack_get_channel_history`

Read read

Get message history for a Slack channel. Supports pagination with cursors.

Parameters: channel, limit, oldest, latest, cursor

Generic CLI call

kosmo integrations:call slack.slack_get_channel_history '{"channel":"example_channel","limit":1,"oldest":"example_oldest","latest":"example_latest","cursor":"example_cursor"}' --json

Provider shortcut

kosmo integrations:slack slack_get_channel_history '{"channel":"example_channel","limit":1,"oldest":"example_oldest","latest":"example_latest","cursor":"example_cursor"}' --json

`slack.slack_get_thread_replies`

Read read

Get all replies in a Slack message thread.

Parameters: channel, ts, limit, cursor

Generic CLI call

kosmo integrations:call slack.slack_get_thread_replies '{"channel":"example_channel","ts":"example_ts","limit":1,"cursor":"example_cursor"}' --json

Provider shortcut

kosmo integrations:slack slack_get_thread_replies '{"channel":"example_channel","ts":"example_ts","limit":1,"cursor":"example_cursor"}' --json

`slack.slack_list_channels`

Read read

List all Slack channels the bot has access to.

Parameters: types, exclude_archived, limit, cursor

Generic CLI call

kosmo integrations:call slack.slack_list_channels '{"types":"example_types","exclude_archived":true,"limit":1,"cursor":"example_cursor"}' --json

Provider shortcut

kosmo integrations:slack slack_list_channels '{"types":"example_types","exclude_archived":true,"limit":1,"cursor":"example_cursor"}' --json

`slack.slack_get_channel`

Read read

Get detailed information about a Slack channel.

Parameters: channel

Generic CLI call

kosmo integrations:call slack.slack_get_channel '{"channel":"example_channel"}' --json

Provider shortcut

kosmo integrations:slack slack_get_channel '{"channel":"example_channel"}' --json

`slack.slack_create_channel`

Write write

Create a new Slack channel.

Parameters: name, is_private

Generic CLI call

kosmo integrations:call slack.slack_create_channel '{"name":"example_name","is_private":true}' --json

Provider shortcut

kosmo integrations:slack slack_create_channel '{"name":"example_name","is_private":true}' --json

`slack.slack_set_topic`

Write write

Set the topic for a Slack channel.

Parameters: channel, topic

Generic CLI call

kosmo integrations:call slack.slack_set_topic '{"channel":"example_channel","topic":"example_topic"}' --json

Provider shortcut

kosmo integrations:slack slack_set_topic '{"channel":"example_channel","topic":"example_topic"}' --json

`slack.slack_set_purpose`

Write write

Set the purpose for a Slack channel.

Parameters: channel, purpose

Generic CLI call

kosmo integrations:call slack.slack_set_purpose '{"channel":"example_channel","purpose":"example_purpose"}' --json

Provider shortcut

kosmo integrations:slack slack_set_purpose '{"channel":"example_channel","purpose":"example_purpose"}' --json

`slack.slack_archive_channel`

Write write

Archive a Slack channel.

Parameters: channel

Generic CLI call

kosmo integrations:call slack.slack_archive_channel '{"channel":"example_channel"}' --json

Provider shortcut

kosmo integrations:slack slack_archive_channel '{"channel":"example_channel"}' --json

`slack.slack_invite_to_channel`

Write write

Invite one or more users to a Slack channel.

Parameters: channel, users

Generic CLI call

kosmo integrations:call slack.slack_invite_to_channel '{"channel":"example_channel","users":"example_users"}' --json

Provider shortcut

kosmo integrations:slack slack_invite_to_channel '{"channel":"example_channel","users":"example_users"}' --json

`slack.slack_upload_file`

Write write

Upload a file to Slack using the modern external upload flow. The file content is posted to a channel or as a thread reply.

Parameters: channel, content, filename, title, initial_comment, thread_ts

Generic CLI call

kosmo integrations:call slack.slack_upload_file '{"channel":"example_channel","content":"example_content","filename":"example_filename","title":"example_title","initial_comment":"example_initial_comment","thread_ts":"example_thread_ts"}' --json

Provider shortcut

kosmo integrations:slack slack_upload_file '{"channel":"example_channel","content":"example_content","filename":"example_filename","title":"example_title","initial_comment":"example_initial_comment","thread_ts":"example_thread_ts"}' --json

`slack.slack_list_files`

Read read

List files in Slack, optionally filtered by channel, user, or file type.

Parameters: channel, user, types, count, page

Generic CLI call

kosmo integrations:call slack.slack_list_files '{"channel":"example_channel","user":"example_user","types":"example_types","count":1,"page":1}' --json

Provider shortcut

kosmo integrations:slack slack_list_files '{"channel":"example_channel","user":"example_user","types":"example_types","count":1,"page":1}' --json

`slack.slack_get_file`

Read read

Get detailed information about a Slack file.

Parameters: file

Generic CLI call

kosmo integrations:call slack.slack_get_file '{"file":"example_file"}' --json

Provider shortcut

kosmo integrations:slack slack_get_file '{"file":"example_file"}' --json

`slack.slack_list_users`

Read read

List all users in the Slack workspace.

Parameters: limit, cursor, include_locale

Generic CLI call

kosmo integrations:call slack.slack_list_users '{"limit":1,"cursor":"example_cursor","include_locale":true}' --json

Provider shortcut

kosmo integrations:slack slack_list_users '{"limit":1,"cursor":"example_cursor","include_locale":true}' --json

`slack.slack_get_user`

Read read

Get detailed information about a Slack user by their user ID.

Parameters: user

Generic CLI call

kosmo integrations:call slack.slack_get_user '{"user":"example_user"}' --json

Provider shortcut

kosmo integrations:slack slack_get_user '{"user":"example_user"}' --json

`slack.slack_find_user_by_email`

Read read

Look up a Slack user by their email address.

Parameters: email

Generic CLI call

kosmo integrations:call slack.slack_find_user_by_email '{"email":"example_email"}' --json

Provider shortcut

kosmo integrations:slack slack_find_user_by_email '{"email":"example_email"}' --json

`slack.slack_add_reaction`

Write write

Add an emoji reaction to a Slack message.

Parameters: channel, name, timestamp

Generic CLI call

kosmo integrations:call slack.slack_add_reaction '{"channel":"example_channel","name":"example_name","timestamp":"example_timestamp"}' --json

Provider shortcut

kosmo integrations:slack slack_add_reaction '{"channel":"example_channel","name":"example_name","timestamp":"example_timestamp"}' --json

`slack.slack_remove_reaction`

Write write

Remove an emoji reaction from a Slack message.

Parameters: channel, name, timestamp

Generic CLI call

kosmo integrations:call slack.slack_remove_reaction '{"channel":"example_channel","name":"example_name","timestamp":"example_timestamp"}' --json

Provider shortcut

kosmo integrations:slack slack_remove_reaction '{"channel":"example_channel","name":"example_name","timestamp":"example_timestamp"}' --json

`slack.slack_list_usergroups`

Read read

List all usergroups in the Slack workspace.

Parameters: include_count, include_disabled, include_users

Generic CLI call

kosmo integrations:call slack.slack_list_usergroups '{"include_count":true,"include_disabled":true,"include_users":true}' --json

Provider shortcut

kosmo integrations:slack slack_list_usergroups '{"include_count":true,"include_disabled":true,"include_users":true}' --json

`slack.slack_update_usergroup_members`

Write write

Update the members of a Slack usergroup.

Parameters: usergroup, users

Generic CLI call

kosmo integrations:call slack.slack_update_usergroup_members '{"usergroup":"example_usergroup","users":"example_users"}' --json

Provider shortcut

kosmo integrations:slack slack_update_usergroup_members '{"usergroup":"example_usergroup","users":"example_users"}' --json

Function Schemas

Use these parameter tables when building CLI payloads without calling integrations:schema first.

`slack.slack_send_message`

Send a message to a Slack channel or DM. Supports text, blocks, and thread replies.

Operation: Write write
Schema command: kosmo integrations:schema slack.slack_send_message --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID or name (e.g., "#general" or "C12345678").
`text`	string	yes	Message text.
`blocks`	string	no	JSON array of Slack Block Kit blocks for rich formatting.
`thread_ts`	string	no	Timestamp of the parent message to reply in a thread.
`reply_broadcast`	boolean	no	If true, also post the reply to the channel (thread_ts required).
`unfurl_links`	boolean	no	If true, enable unfurling of links.
`markdown`	boolean	no	If true, enable mrkdwn formatting in text.

`slack.slack_update_message`

Update an existing Slack message.

Operation: Write write
Schema command: kosmo integrations:schema slack.slack_update_message --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID where the message was posted.
`ts`	string	yes	Timestamp of the message to update.
`text`	string	no	New message text.
`blocks`	string	no	JSON array of Slack Block Kit blocks.

`slack.slack_delete_message`

Delete a message from a Slack channel.

Operation: Write write
Schema command: kosmo integrations:schema slack.slack_delete_message --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID where the message was posted.
`ts`	string	yes	Timestamp of the message to delete.

`slack.slack_get_message`

Get a specific message by its timestamp. Optionally fetch a message within a thread.

Operation: Read read
Schema command: kosmo integrations:schema slack.slack_get_message --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID.
`ts`	string	yes	Timestamp of the message to retrieve.
`thread_ts`	string	no	If provided, fetches a reply within this thread instead.

`slack.slack_search_messages`

Search for messages across all Slack channels and DMs.

Operation: Read read
Schema command: kosmo integrations:schema slack.slack_search_messages --json

Parameter	Type	Required	Description
`query`	string	yes	Search query. Supports Slack search modifiers like "from:", "in:", "has:", etc.
`count`	integer	no	Number of results per page (default 20, max 100).
`page`	integer	no	Page number of results (default 1).
`sort`	string	no	Sort order: "score" (default) or "timestamp".
`sort_dir`	string	no	Sort direction: "desc" (default) or "asc".

`slack.slack_get_permalink`

Get a permalink URL for a specific Slack message.

Operation: Read read
Schema command: kosmo integrations:schema slack.slack_get_permalink --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID where the message is posted.
`message_ts`	string	yes	Timestamp of the message.

`slack.slack_get_channel_history`

Get message history for a Slack channel. Supports pagination with cursors.

Operation: Read read
Schema command: kosmo integrations:schema slack.slack_get_channel_history --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID.
`limit`	integer	no	Number of messages to return (default 100, max 1000).
`oldest`	string	no	Start of time range, as a Unix timestamp.
`latest`	string	no	End of time range, as a Unix timestamp.
`cursor`	string	no	Pagination cursor from a previous response.

`slack.slack_get_thread_replies`

Get all replies in a Slack message thread.

Operation: Read read
Schema command: kosmo integrations:schema slack.slack_get_thread_replies --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID.
`ts`	string	yes	Timestamp of the parent message (thread root).
`limit`	integer	no	Number of replies to return per page (default 1000).
`cursor`	string	no	Pagination cursor from a previous response.

`slack.slack_list_channels`

List all Slack channels the bot has access to.

Operation: Read read
Schema command: kosmo integrations:schema slack.slack_list_channels --json

Parameter	Type	Required	Description
`types`	string	no	Comma-separated channel types: "public_channel", "private_channel", "mpim", "im". Default: "public_channel".
`exclude_archived`	boolean	no	Exclude archived channels (default: true).
`limit`	integer	no	Number of channels to return per page (default 100, max 1000).
`cursor`	string	no	Pagination cursor from a previous response.

`slack.slack_get_channel`

Get detailed information about a Slack channel.

Operation: Read read
Schema command: kosmo integrations:schema slack.slack_get_channel --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID.

`slack.slack_create_channel`

Create a new Slack channel.

Operation: Write write
Schema command: kosmo integrations:schema slack.slack_create_channel --json

Parameter	Type	Required	Description
`name`	string	yes	Channel name (lowercase, no spaces, max 80 chars).
`is_private`	boolean	no	Create a private channel instead of a public one (default: false).

`slack.slack_set_topic`

Set the topic for a Slack channel.

Operation: Write write
Schema command: kosmo integrations:schema slack.slack_set_topic --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID.
`topic`	string	yes	The new topic text.

`slack.slack_set_purpose`

Set the purpose for a Slack channel.

Operation: Write write
Schema command: kosmo integrations:schema slack.slack_set_purpose --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID.
`purpose`	string	yes	The new purpose text.

`slack.slack_archive_channel`

Archive a Slack channel.

Operation: Write write
Schema command: kosmo integrations:schema slack.slack_archive_channel --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID to archive.

`slack.slack_invite_to_channel`

Invite one or more users to a Slack channel.

Operation: Write write
Schema command: kosmo integrations:schema slack.slack_invite_to_channel --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID.
`users`	string	yes	Comma-separated list of user IDs to invite.

`slack.slack_upload_file`

Upload a file to Slack using the modern external upload flow. The file content is posted to a channel or as a thread reply.

Operation: Write write
Schema command: kosmo integrations:schema slack.slack_upload_file --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID to post the file to.
`content`	string	yes	File content (text).
`filename`	string	yes	Filename with extension (e.g., "report.txt").
`title`	string	no	Title of the file.
`initial_comment`	string	no	Comment to include with the file post.
`thread_ts`	string	no	Timestamp of the parent message to reply in a thread.

`slack.slack_list_files`

List files in Slack, optionally filtered by channel, user, or file type.

Operation: Read read
Schema command: kosmo integrations:schema slack.slack_list_files --json

Parameter	Type	Required	Description
`channel`	string	no	Channel ID to filter files by.
`user`	string	no	User ID to filter files by.
`types`	string	no	Comma-separated file types: "spaces", "snippets", "images", "gdocs", "zips", "pdfs".
`count`	integer	no	Number of files per page (default 100).
`page`	integer	no	Page number (default 1).

`slack.slack_get_file`

Get detailed information about a Slack file.

Operation: Read read
Schema command: kosmo integrations:schema slack.slack_get_file --json

Parameter	Type	Required	Description
`file`	string	yes	File ID.

`slack.slack_list_users`

List all users in the Slack workspace.

Operation: Read read
Schema command: kosmo integrations:schema slack.slack_list_users --json

Parameter	Type	Required	Description
`limit`	integer	no	Number of users per page (default 100, max 1000).
`cursor`	string	no	Pagination cursor from a previous response.
`include_locale`	boolean	no	Include user locale information (default: false).

`slack.slack_get_user`

Get detailed information about a Slack user by their user ID.

Operation: Read read
Schema command: kosmo integrations:schema slack.slack_get_user --json

Parameter	Type	Required	Description
`user`	string	yes	User ID.

`slack.slack_find_user_by_email`

Look up a Slack user by their email address.

Operation: Read read
Schema command: kosmo integrations:schema slack.slack_find_user_by_email --json

Parameter	Type	Required	Description
`email`	string	yes	Email address to look up.

`slack.slack_add_reaction`

Add an emoji reaction to a Slack message.

Operation: Write write
Schema command: kosmo integrations:schema slack.slack_add_reaction --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID where the message is posted.
`name`	string	yes	Emoji name without colons (e.g., "thumbsup", "heart").
`timestamp`	string	yes	Timestamp of the message to react to.

`slack.slack_remove_reaction`

Remove an emoji reaction from a Slack message.

Operation: Write write
Schema command: kosmo integrations:schema slack.slack_remove_reaction --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID where the message is posted.
`name`	string	yes	Emoji name without colons (e.g., "thumbsup", "heart").
`timestamp`	string	yes	Timestamp of the message.

`slack.slack_list_usergroups`

List all usergroups in the Slack workspace.

Operation: Read read
Schema command: kosmo integrations:schema slack.slack_list_usergroups --json

Parameter	Type	Required	Description
`include_count`	boolean	no	Include the number of users in each usergroup (default: false).
`include_disabled`	boolean	no	Include disabled usergroups (default: false).
`include_users`	boolean	no	Include the list of users in each usergroup (default: false).

`slack.slack_update_usergroup_members`

Update the members of a Slack usergroup.

Operation: Write write
Schema command: kosmo integrations:schema slack.slack_update_usergroup_members --json

Parameter	Type	Required	Description
`usergroup`	string	yes	Usergroup ID.
`users`	string	yes	Comma-separated list of user IDs to set as members.

Permissions

Headless calls still follow the integration read/write permission policy. Configure read/write defaults with integrations:configure. Add --force only for trusted automation that should bypass that policy.